MIlk Changes at 3 months?

Moo slept for ages last night - he didnt wake up for his 2am feed and
after his 4am feed he was fine until 7.30, no grizzling, no crying
just plain happy to wait for breakfast!

Someone told me that my milk will change at around 3 months old and
get more calories, does anyone kow anymore about it, and if it happens
again?

Moo has been limpet boy for the last week, feeding most all the time,
I thout it was becouase his teeth were bothering him, but it makes
senes that he is geting my milk to change.

teapot